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Question 1. What are Linear equations in two variables? by Vikrant class X, 16 Dec 2006Answer 1. A Linear equation in two variables is an equation with two variables (for eg. x and y) each having exponent 1. (eg. x + 2y = 4).Definition: An equation of the form ax + by + c = 0 where a, b, c are real numbers and at least one of a, b is non zero.

Question 2. When I plot x - y = 10 and 2x - 3y = - 20 on graph I get almost parallel lines but on solution I get an answer. How to get an answer on graph ? by simran X 18 Dec 2006Answer 2. For these types of equations the scale has to be adjusted to a bigger value for example 1cm. = 10 units, using this scale you will see intersecting lies.

Question 5. How many questions are expected from Instalments? by harjot singh class x 21 Dec 2006Answer 5. We get 2 questions one from S.I. and the other from C.I. which carry 2 and 3 marks.

Question 6. Solve 31x + 23y = 39, 23x + 31y = 15 by manik X, 22 Dec 2006Answer 6. Here we find the coefficients of x and y have been interchanged in the two equations, in such cases we once add the equations and once subtract them adding the equations we get 54x + 54y = 54 which reduces to x + y = 1 ......i subtracting the equations we get 8x - 8y = 24 which reduces to x - y = 3 ......ii further adding i and ii we get 2x = 4 which gives x = 2 and y = - 1

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Question 7. I am very weak in mathematics I failed in the Dec exams. Which topics should I do to at least get passing marks? sahil class x 24.12.06Answer 7. Dear sahil don not worry, you can easily pass in CBSE board exams 2007. For details of easy topics see our page ' pre exam tips' click here